Anthony French, Diamond expert at Austen & Blake, stated: “The brooch, designed by Andrew Grima, is crafted in yellow gold and features carved ruby and diamond embellishments.

“The Queen has worn this special piece on many occasions, and for an estimated price tag of £10,000, she is definitely getting her money’s worth.”

Charlotte White, Head of Design at 77 Diamonds, Europe’s largest online jeweller, believes that the Scarab brooch is one of the Queen’s most prized jewels.

Indeed, the Queen’s “spectacular and extensive collection of brooches spans world-record breaking, historical and sentimental pieces”.